Electrical condenser



Jan. 19, 1932.

P. E. GlLLlNG ELECTRICAL CONDENSER Filed Feb. 27, 1929 I INVENTOI? PRESTON E. G/lL/NG A TTORNE V Patented Jan. 19, 1932 UNITED STATES PATENT OFFICE PRESTON"v E. GILLIN G, OIE HADDON HEIGHTS, NEW JERSEY, ASSIGNOB 1'0 RADIO CONDENSER COMPANY, OF CAMDEN, NEW JERSEY ELECTRICAL CONDENSER This invention relates to improvements in the design of an electrical condenser of the variable type such as are used in radio receiving circuits. In radio receiving sets it has become quite customary to use a plurality of condensers which'tune the various stages by a single control, and where condensers are so operated, it is very important that each tuned circuit be at the maximum point of resonance for the stations which it is desired to tune in.

Due to the variations in the manufacture of tuning condensers and the variations which occur in the coils used in the tunable circuits, and further due to the location of the various pieces of apparatus in the receiving set, there must be some means of adjusting each condenser so as to change its initial capacity curve suificiently to bring all of the tunable circuits to the maximum point of their resonance curves at any setting of the unit control device. V

In the past, various compensating means have been proposed and it is the object of my present invention to provide a compensating means that is much simpler than the arrangements heretofore proposed of which I am aware. In attaining the principal ob ect, other ancillary objects will be apparent from a study of the specification taken in connection with the annexed drawings, wherein Figure 1 is a side elevation of a single unit condenser to which I have applled my m provement, the rotor-of the condenser being in fully exposed position or out of engagement with the stator.

Fi ure 2 is a side view ta of Figure 1.

Figure 3 is a view taken on the line 3-3 of Figure 2. V

Figure 4 shows a plate to carry the compensatin adjusting screw and which may be used witfi the condenser shown.

In the drawings, 1 is the base of a condenser having bearing supports 2 and 3 extending therefrom. The bearing supports 2 and 3 ken from the left carry a shaft 4 on which is su ported a sleeve 5 carrying a group of space rotor plates 6. Preferably, one of the free ends of the rotor plates is anchored together by a tie bar 7 The outer rotor plate 8 has a segment 9 cut along the line 10 for the major ortion of the periphery of the segment whic it will be seen comprises the greater portion of the area of the plate 8. By leaving the segment 9 anchored to the plate 8, as indicated, between the points 11 and 12, the segment 9 can be moved back and forth by suitable actuating means, and this means is provided in the shape'of an arm 13 carried on the rotor sleeve 5.

The arm 13 has a clearance hole therethrough to receive a screw 14 which is threaded into the segment 9 so that the segment may be changed in position with respect to the rest of: the plate 8 from which the segment 55 9 is formed.

Cooperating with the group of rotor plates 6, is a group of stator plates 15 that are anchored to tie bars 16 and 17 disposed at opposite ends of the stator lates. These tie bars 16 and 17 are fastene to insulators 18 and 19 in any satisfactory manner as by screws 20, the insulators 18 and 19 being fastened toframe 1 in any satisfactory manner as by screws 21. Electrical contact is made to the stator plates by terminal 22 carried beneath the head of one of the screws 20 that engages one of the tie bars. In the form of condenser shown, the stator group of plates has an additional intermediate tie bar 23.

I can apply my compensating idea to the stator as well asthe rotor, and this is indicated' byFigures 2 and 3, wherein asegment 5 24 is cut from the outer stator plate 15 in a manner similar to the segment 9 on the rotor plate 8. As shown in Figure 3, the tie bar .23 may be longenough so that its'end 25 can' be bent upward and the adjusting screw .0

14 mounted in the upper end of the bent portion 25.

As an alternative arrangement, the tie bar 17 may be extended and similarly bent so as to carry the adjusting screw for the segment 24.

As a further alternative arrangement, instead of using either of the tie bars 17 or 23, a plate 27 may be mounted immediately adjacent the outer stator plate 15 and Connected to the tie bars-16 and 17. As shown in Figure 4, ahole 28 is used to receive the screw 14 for actuating the segment 24. Either or both of the arrangements may be used in the same condenser, and while I have shown in this application, a single condenser which may be connected to another for multiple operation, the improvement may also be applied to condensers arranged in tandem in a single frame for unit control.

From what has been said, it will be oh served that I have provided a very simple and inex ensive form of compensating means whic specific arrangement is claimed herein.

Having thus described my invention, what I claim is:

1. In an electrical condenser including a stator and a rotor, each composed of a group of plates spaced for interleaving relationship as the rotor is operated, and means for altering the capacity curve of the condenser, said means comprising a single segment forming part of and cut from the outer plate of one of said groups with means for positively adjusting the position of the segment.

2. In an electrical condenser including a stator and a rotor, each composed of a group of plates spaced for interleaving relationship as the rotor is operated, and means for altering the capacity curve of the condenser, said means comprising a single segment forming the greater part of and cut for the greater part of its periphery from the outer plate of one of said groups with means-for positively adjusting the position of the segment.

3. In an electrical condenser including a stator and a rotor, each composed of a group of plates spaced for interleaving relationship as the rotor is operated, at least the outer plate of one of said groups having a single segment comprising the major part, of its area cut from the said plate, the cut extending for the major part of the periphery of the segment, and positive means for adjusting the position of the segment with respect to the balance of the plate.

4. In an electrical condenser including a stator and a rotor, each composed of a group of plates spaced for interleaving relationship as the rotor is operated, at least the stator group of plates being tied together by tie bars and at least the outer plate of one of said groups having a single segment comprising the major part of its area cut from said plate, the cut extendingfor the major part of the periphery of the segment, and a screw carried 

